Kenji Arai / Mbed OS Nucleo_RTC_battery_bkup_pwr_off_okay

In the past, you need modify rtc_api.c in mbed-dev source code. From this revision, you can just use RTC function all of conditions (Normal, Reset, Stand-by, Power OFF).

Note

From now on, you do NOT need any modification for mbed-dev library because STM team updates rtc_api.c source code and support RTC function under reset & standby condition includes power off condition (You need additional VBAT back-up hardware).

Please refer following NOTE information.
/users/kenjiArai/notebook/nucleo-series-rtc-control-under-power-onoff-and-re/

main.cpp@7:27a1cf7f8921, 2016-05-27 (annotated)

Committer:
kenjiArai
Date:
Fri May 27 20:19:49 2016 +0000
Revision:
7:27a1cf7f8921
Parent:
6:5ada291037aa
Child:
8:bf593344668e
added L476RG.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:0751c92c0f71 1 /*
kenjiArai 0:0751c92c0f71 2 * mbed Application program
kenjiArai 0:0751c92c0f71 3 * RTC (inside STM32x CPU) test program
kenjiArai 0:0751c92c0f71 4 *
kenjiArai 7:27a1cf7f8921 5 * Copyright (c) 2015,'16 Kenji Arai / JH1PJL
kenjiArai 0:0751c92c0f71 6 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:0751c92c0f71 7 * http://mbed.org/users/kenjiArai/
kenjiArai 0:0751c92c0f71 8 * Created: January 17th, 2015
kenjiArai 7:27a1cf7f8921 9 * Revised: May 28th, 2016
kenjiArai 0:0751c92c0f71 10 *
kenjiArai 0:0751c92c0f71 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
kenjiArai 0:0751c92c0f71 12 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
kenjiArai 0:0751c92c0f71 13 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:0751c92c0f71 14 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kenjiArai 0:0751c92c0f71 15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:0751c92c0f71 16 */
kenjiArai 0:0751c92c0f71 17
kenjiArai 0:0751c92c0f71 18 // Include ---------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 19 #include "mbed.h"
kenjiArai 0:0751c92c0f71 20 #include "TextLCD.h"
kenjiArai 2:77ec44bf1fa5 21 // MUST -> need to modify rtc_api.c, please refer SetRTC.h file [CAUTION] and modify_info_xxx.h
kenjiArai 0:0751c92c0f71 22 #include "SetRTC.h"
kenjiArai 0:0751c92c0f71 23
kenjiArai 0:0751c92c0f71 24 // Definition ------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 25 #define SHOW_KEY_PROMPT 30
kenjiArai 0:0751c92c0f71 26
kenjiArai 6:5ada291037aa 27 //#define USE_LCD
kenjiArai 0:0751c92c0f71 28
kenjiArai 7:27a1cf7f8921 29 #if (defined(TARGET_STM32F401RE) || defined(TARGET_STM32F411RE) \
kenjiArai 7:27a1cf7f8921 30 || defined(TARGET_STM32L152RE) || defined(TARGET_STM32F334R8) \
kenjiArai 7:27a1cf7f8921 31 || defined(TARGET_STM32L476RG) )
kenjiArai 1:7a48c475bbd2 32 #else
kenjiArai 7:27a1cf7f8921 33 #error "Target is only Nucleo F401RE, F411RE, F334R8, L476RG and L152RE"
kenjiArai 1:7a48c475bbd2 34 #endif
kenjiArai 1:7a48c475bbd2 35
kenjiArai 0:0751c92c0f71 36 // Object ----------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 37 DigitalIn userSW(USER_BUTTON);
kenjiArai 0:0751c92c0f71 38 DigitalOut myled(LED1); // Indicate the sampling period
kenjiArai 0:0751c92c0f71 39 Serial pc(USBTX, USBRX);
kenjiArai 7:27a1cf7f8921 40 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 41 I2C i2c(D14,D15); // SDA, SCL
kenjiArai 0:0751c92c0f71 42 TextLCD_I2C_N lcd(&i2c, 0x7c, TextLCD::LCD8x2); // LCD(Akizuki AQM0802A)
kenjiArai 7:27a1cf7f8921 43 #endif
kenjiArai 6:5ada291037aa 44 DigitalOut pwr_onoff(PA_9);
kenjiArai 0:0751c92c0f71 45
kenjiArai 0:0751c92c0f71 46 // RAM -------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 47
kenjiArai 0:0751c92c0f71 48 // ROM / Constant data ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 49
kenjiArai 0:0751c92c0f71 50 // Function prototypes ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 51
kenjiArai 0:0751c92c0f71 52 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 53 // Control Program
kenjiArai 0:0751c92c0f71 54 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 55 int main()
kenjiArai 0:0751c92c0f71 56 {
kenjiArai 0:0751c92c0f71 57 char buf[42]; // data buffer for text
kenjiArai 0:0751c92c0f71 58 time_t seconds;
kenjiArai 0:0751c92c0f71 59 uint8_t counter = SHOW_KEY_PROMPT;
kenjiArai 4:a9cebfe4715f 60 uint8_t wait_counter = 0;
kenjiArai 4:a9cebfe4715f 61 uint8_t xtal = 0;
kenjiArai 0:0751c92c0f71 62
kenjiArai 6:5ada291037aa 63 pwr_onoff = 1;
kenjiArai 6:5ada291037aa 64 wait(2.0);
kenjiArai 0:0751c92c0f71 65 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 66 // lcd
kenjiArai 0:0751c92c0f71 67 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 68 // 12345678
kenjiArai 0:0751c92c0f71 69 lcd.printf(" RTC ");
kenjiArai 0:0751c92c0f71 70 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 71 // 12345678
kenjiArai 0:0751c92c0f71 72 lcd.puts(" JH1PJL ");
kenjiArai 0:0751c92c0f71 73 lcd.setContrast(0x14);
kenjiArai 0:0751c92c0f71 74 #endif
kenjiArai 0:0751c92c0f71 75 pc.printf("\r\n\r\nTest Nucleo RTC Function\r\n");
kenjiArai 2:77ec44bf1fa5 76 myled = !myled;
kenjiArai 5:bc464a588c2e 77 if (SetRTC(0) == 1) {
kenjiArai 2:77ec44bf1fa5 78 pc.printf("External");
kenjiArai 4:a9cebfe4715f 79 xtal = 1;
kenjiArai 2:77ec44bf1fa5 80 } else {
kenjiArai 2:77ec44bf1fa5 81 pc.printf("Internal");
kenjiArai 4:a9cebfe4715f 82 xtal = 0;
kenjiArai 2:77ec44bf1fa5 83 }
kenjiArai 2:77ec44bf1fa5 84 pc.printf(" Xtal for RTC\r\n");
kenjiArai 2:77ec44bf1fa5 85 show_RTC_reg(); // only for debug purpose
kenjiArai 0:0751c92c0f71 86 // waiting for Initial screen
kenjiArai 0:0751c92c0f71 87 myled = 1;
kenjiArai 0:0751c92c0f71 88 wait(1.0);
kenjiArai 0:0751c92c0f71 89 myled = !myled;
kenjiArai 0:0751c92c0f71 90 wait(1.0);
kenjiArai 0:0751c92c0f71 91 while(1) {
kenjiArai 0:0751c92c0f71 92 seconds = time(NULL);
kenjiArai 0:0751c92c0f71 93 strftime(buf, 40, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
kenjiArai 4:a9cebfe4715f 94 if (xtal){
kenjiArai 4:a9cebfe4715f 95 pc.printf("[Time] %s", buf);
kenjiArai 4:a9cebfe4715f 96 } else {
kenjiArai 4:a9cebfe4715f 97 pc.printf("[Time by Internal Clock] %s", buf);
kenjiArai 4:a9cebfe4715f 98 }
kenjiArai 0:0751c92c0f71 99 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 100 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 101 strftime(buf, 40, "%b%d'%y", localtime(&seconds));
kenjiArai 0:0751c92c0f71 102 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 103 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 104 strftime(buf, 10, "%H:%M:%S", localtime(&seconds));
kenjiArai 0:0751c92c0f71 105 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 106 #endif
kenjiArai 2:77ec44bf1fa5 107 --counter;
kenjiArai 0:0751c92c0f71 108 if (counter){
kenjiArai 7:27a1cf7f8921 109 // 012345678901234567890123456789012345678901234567890123456789012
kenjiArai 7:27a1cf7f8921 110 pc.printf("Is a time correct? If no, please hit any key for adjustment.\r");
kenjiArai 2:77ec44bf1fa5 111 }
kenjiArai 4:a9cebfe4715f 112 wait_counter = 0;
kenjiArai 2:77ec44bf1fa5 113 while (seconds == time(NULL)){
kenjiArai 0:0751c92c0f71 114 if (pc.readable() == 1){
kenjiArai 0:0751c92c0f71 115 buf[0] = pc.getc(); // dummy read
kenjiArai 0:0751c92c0f71 116 time_enter_mode();
kenjiArai 0:0751c92c0f71 117 }
kenjiArai 2:77ec44bf1fa5 118 if (userSW == 0){
kenjiArai 0:0751c92c0f71 119 #if defined(USE_LCD)
kenjiArai 2:77ec44bf1fa5 120 lcd.locate(0, 0); // 1st line top
kenjiArai 2:77ec44bf1fa5 121 // 12345678
kenjiArai 2:77ec44bf1fa5 122 lcd.printf(" Enter ");
kenjiArai 2:77ec44bf1fa5 123 lcd.locate(0, 1); // 2nd line top
kenjiArai 2:77ec44bf1fa5 124 // 12345678
kenjiArai 2:77ec44bf1fa5 125 lcd.printf(" Sleep " );
kenjiArai 0:0751c92c0f71 126 #endif
kenjiArai 3:7b3edf54c706 127 // 123456789012345678901234567890123456789012345678
kenjiArai 3:7b3edf54c706 128 pc.printf("\r\nEnter Standby Mode, please push RESET to wake-up\r\n");
kenjiArai 2:77ec44bf1fa5 129 wait(1.0);
kenjiArai 2:77ec44bf1fa5 130 myled = 0;
kenjiArai 3:7b3edf54c706 131 goto_standby();
kenjiArai 2:77ec44bf1fa5 132 }
kenjiArai 4:a9cebfe4715f 133 wait(0.05);
kenjiArai 4:a9cebfe4715f 134 if (++wait_counter > (2000 / 50)){
kenjiArai 4:a9cebfe4715f 135 if (xtal){
kenjiArai 4:a9cebfe4715f 136 pc.printf("Time was not updated! External Xtal does NOT oscillate.\r\n");
kenjiArai 4:a9cebfe4715f 137 } else {
kenjiArai 4:a9cebfe4715f 138 pc.printf("Time was not updated! LSI does NOT work.\r\n");
kenjiArai 4:a9cebfe4715f 139 }
kenjiArai 4:a9cebfe4715f 140 break;
kenjiArai 4:a9cebfe4715f 141 }
kenjiArai 0:0751c92c0f71 142 }
kenjiArai 2:77ec44bf1fa5 143 if (counter){
kenjiArai 3:7b3edf54c706 144 // 12345678901234567890123456789012345678901234567890
kenjiArai 7:27a1cf7f8921 145 pc.printf(" \r"); // Not use '\n'
kenjiArai 2:77ec44bf1fa5 146 }
kenjiArai 2:77ec44bf1fa5 147 myled = !myled;
kenjiArai 0:0751c92c0f71 148 }
kenjiArai 0:0751c92c0f71 149 }